Re: [PATCH 1/3] x86, cacheinfo: Fix disabling of L3 cache indexes

From: H. Peter Anvin
Date: Wed Jan 20 2010 - 18:06:26 EST

On 01/19/2010 03:07 AM, Borislav Petkov wrote:
> +static void __wbinvd(void *dummy)
> +{
> + asm volatile("wbinvd" : : : "memory");
> +}
> +


> + smp_call_function_single(cpu, __wbinvd, NULL, 1);

I really don't like this combination.

First of all, it's an asm version of an instruction we already have
macros for. This should probably just be wbinvd(), or *possibly*
native_wbinvd(), although that would have to be justified -- especially
since the preexisting code used wbinvd().

Second, it's pretty obvious that the only reason for this function at
all is to provide a wrapper that can be passed to smp_call_function*().
It would be a lot cleaner to have a small function wbinvd_on_cpu(cpu)
as a wrapper for the higher-order functionality.

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